crooked vs underhand

crooked and underhand both are adjectives.

Word	Noun	Adjective	Verb	Adverb
crooked	No	Yes	No	No
underhand	No	Yes	No	Yes

crooked (adjective)	underhand (adjective)
having or marked by bends or angles; not straight or aligned	with hand brought forward and up from below shoulder level
not straight; dishonest or immoral or evasive	marked by deception
irregular in shape or outline
having the back and shoulders rounded; not erect

crooked (adverb)	underhand (adverb)
	with the hand swung below shoulder level
	slyly and secretly